Joint assembly of a car windshield wiper arm

ABSTRACT

An upper cover body has left and right grooves between a solid core and left and right sides; a round groove near a front side; a rear facing receptacle across a rear of the solid core; the left and right sides including left and right ribs extending to the rear end encompassing a hollow socket; an elastic embed hook on the rear end corresponding with the receptacle and having a forward facing nose. A chassis has a bottom plate, left and right plates extending upward from respective sides of the bottom plate, and a rear plate; a fixing hole in the bottom plate; an upright curbing plate at the rear end of the bottom plate; a front horizontal fixing pivot between the left and right plates; an upright hollow plug encompassed by the left, right, and rear plates; an insetting hole centered in the rear plate.

FIELD OF THE PRESENT INVENTION

The present invention relates to a joint assembly of a windshield wiperarm, more particularly being contrived for the wiper arm withtrapezohedron shaft. Hence, the drawback of hurting windshield caused bythe wiper dropping off during replacement procedure of worn wiper by newone can be avoided.

BACKGROUND OF THE PRESENT INVENTION

Presently, the types in head of windshield wiper arm are many invariety. Different type design of wiper arm head must be coordinatedwith its exclusive jointer to enable securely joint each other. Such asUSA issued patents U.S. Pat. No. 6,516,491, U.S. Pat. No. 6,643,889,U.S. Pat. No. 6,668,419, U.S. Pat. No. 6,810,556, U.S. Pat. No.6,836,927, U.S. Pat. No. 6, 836,926, U.S. Pat. No. 6,874,195, U.S. Pat.No. 6,886,213 and U.S. Pat. No. 6,904,639 as well as USA publishedpatents US2004/0025280 and US2004/0098821, all disclosed their differenttypes of wiper arm head in association with its exclusive jointers. Inwhich, a conventional wiper arm 1 having a trapezohedron shaft 2 at itshead with its exclusive jointer is shown in the FIG. 1 through FIG. 7.The free end of the wiper arm 1 is pivoted with a trapezohedron shaft 2,and its other fixing end is soundly locked on the output shaft of thewiper motor (not shown in the figures); an elastic foldable articulation4 is fitted near its fixing end to enable said wiper arm 1 being foldedin upright position during replacing worn wiper blade by new one.Wherein, a bezel notch 2 a is contrived in the wider surface of saidtrapezohedron shaft 2; and a spindle hole 2 b is created in its centralaxial line to be inserted a fixing spindle 3 in order to enable itselfrotate freely between a pair of parallel and symmetrically protrudedholding plates 1 a:1 b on the both sides in front end of said wiper arm1 (as shown in the 1A-1A sectional view of the FIG. 1).

Refer to FIG. 3 through FIG. 5, the exclusively coordinated jointer ofsaid wiper arm 1 with said trapezohedron shaft 2 on the head comprises amain body 10, a sliding canopy 20 and a stopping plate 30; wherein, atrapezohedron receptacle 11 is concaved in the center of said main body10 in upright position with opening upwards; a fixing hole 12 isperforated at the center in bottom side of said trapezohedron receptacle11, and a pair of symmetrical sliding seat is formed on both sides ofsaid trapezohedron receptacle 11; a unitary-molded parallel andsymmetrical inset clip 14 is molded at the bottom portion of each saidsliding seat 13; in which, a pair of parallel and symmetrical uppersliding rail 131 is built on the top surface of each said sliding seat13, and a pair of parallel and symmetrical lower sliding track 132 iscreated the joint with said inset clip 14 at its bottom side; Saidsliding canopy 20 is a cannulation compassed by a front side, a leftside, a right side and a top side; a pair of parallel and symmetricallower sliding rail 21 is formed at bottom in each inner wall of its leftside and right side, and a protruding bar 22 is molded at center ininner wall of its top side; Said stopping plate 30 is pressed by arectangular metal plate with both long lateral edge being bent downwardsto form a pair of parallel and symmetrical upper sliding track 31; aindented downwards elastic bulge buckle 32 and an infixing bar hole 33is respectively pressed at the center of its top side. By means ofsqueezing said protruding bar 22 inset in said sliding canopy 20 frominfixing bar hole 33, said stopping plate 30 can be fixed on the innerwall in top side of said sliding canopy 20 (as shown in the 4B-4Bsectional view of the FIG. 4); by further means of aligning said lowersliding rail 21 on said sliding canopy 20 and said upper sliding track31 on said stopping plate 30 respectively with said lower sliding track132 and said upper sliding rail 131 on said stopping plate 30, theopening of said trapezohedron receptacle 11 on said main body 10 (asshown in the FIG. 5).

The rigging assembly of said wiper arm 1 with said trapezohedron shaft 2on the head and windshield wiper is shown in the FIG. 6 through FIG. 9.First, by means of grasping the central position of said wiper elasticstrip 5 from said parallel inset clip 14 at the bottom of said main body10 and riveting through said fixing hole 12, both of said main body 10and said wiper elastic strip 5 can be intimately engaged steadfastly (asshown in the 8C-8C sectional view of the FIG. 8); Next, slide saidsliding canopy 20 outwards to prevent said stopping plate 30 fromblocking the opening of said trapezohedron receptacle 11 on said mainbody 10 (as shown in the FIG. 6); Then, with keeping said bezel notch 2a face upwards, by means of aligning said trapezohedron shaft 2 on thehead of said wiper arm 1 with the opening of said trapezohedronreceptacle 11, said trapezohedron shaft 2 can be smoothly mounted insaid trapezohedron receptacle 11 (as shown in FIG. 7); subsequently,slide said sliding canopy 20 towards said wiper arm 1 up to said elasticbulge buckle 32 on said stopping plate 30 falling into said bezel notch2 a on the top surface of said trapezohedron shaft 2 with snap sound,the rigging couple of said wiper arm 1 with windshield wiper is finishednow. Consequently, said trapezohedron shaft 2 is embedded to preventfrom detaching out of said trapezohedron receptacle 11 (as shown in the8C-8C sectional view of FIG. 8); furthermore, with free rotationfunction of said trapezohedron shaft 2, said wiper is enabled to sway ortilt on said wiper arm 1 in some limit (as shown in the hypotheticaldash-line image of the FIG. 9). However, during the replacement of wornwiper by new one, the aforesaid jointer of said trapezohedron shaft 2has the drawback of being easy to inadvertently drop and hurt thewindshield or the lacquer of the hood. Refer to FIG. 10 and FIG. 11, theworn wiper must be first dismantled from said wiper arm 1 beforereplacement by means of applying an upwards force on said wiper arm 1,which tightly stays with the windshield G in horizontal position (asshown in the FIG. 10); With pivot of said elastic foldable articulation4, said wiper arm 1 become in upright position to enable the wiperscraping blade 6 folded away from windshield G (as shown in FIG. 11);Then, the dismantle procedure can be start to proceed with steps shownin each sectional view of the FIG. 12 as below:

a. With fingers holding on both lateral sides of said sliding canopy 20,apply a force on it towards the lengthwise direction away of the head insaid wiper arm 1 (as shown the force F action illustration of the FIG.12);

b. If acting force F is greater than the engaging force of said elasticbulge buckle 32 in said stopping plate 30, said elastic bulge buckle 32can be slipped out of said bezel notch 2 a on said trapezohedron shaft 2(as shown in B view of the FIG. 12);

c. During said sliding canopy 20 sliding outwards, said stopping plate30 will not block the opening of said trapezohedron receptacle 11 anymore (as shown in C view of the FIG. 12); then, under the gravity, saidwiper scraping blade 6 and said main body 10 will separate off saidtrapezohedron shaft 2 on the head of said wiper arm 1 for their totalweight (as shown in D view of the FIG. 12) to finish the dismantleprocedure of worn wiper.

In aforementioned step a, said wiper arm 1 can unexpectedly re-bounceback to horizontal position with hurt on the surface of said windshieldG in consequence of a horizontal component force F1 of said acting forceF will simultaneously apply a torque on the head of said wiper arm 1 tocause the reaction of spring force on said elastic foldable articulation4; And, In step b, the apply force can easily be too much so that saidsliding canopy 20 detach off said main body 10 to drop on saidwindshield G or the ground for having acting force F greater than theengaging force of said elastic bulge buckle 32 ; Furthermore, in step c,any careless will let total worn wiper scraping blade 6 hit and hurtsaid windshield G in bad consequence of dropping without catching it intime.

SUMMARY OF THE PRESENT INVENTION

The main object of the present invention is to provide a joint of a carwindshield wiper arm, which comprises an upper cover body and a chassis;Exploiting the round groove cut of the upper cover body and the fixingpivot on the chassis being intimately engaged each other to serve as apivot, as well as the elastic upright embed hook of the upper cover bodyand the insetting hole on the chassis being inset each other, hence, thedrawback of hurting windshield caused by said wiper being dropped offduring replacement procedure of worn wiper by new one can be avoided.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is the 3-D illustrative view of the conventional wiper arm withtrapezohedron shaft.

FIG. 1A is a cross sectional view on line 1A-1A of FIG. 1.

FIG. 2 is the partial 3-D illustrative view of the conventional wiperarm with trapezohedron shaft.

FIG. 3 is the first exploded view in decomposition of a joint assemblyin association with the conventional wiper arm with trapezohedron shaft.

FIG. 4 is the second exploded view of a joint assembly in decompositionin association with the conventional wiper arm with trapezohedron shaft.

FIG. 4B is a cross sectional view on line 4B-4B of FIG. 4.

FIG. 5 is the 3-D view of a joint assembly in composition in associationwith the conventional wiper arm with trapezohedron shaft.

FIG. 6 is the first 3-D illustrative view in assembly of theconventional wiper arm with trapezohedron shaft in association with itsjoint assembly.

FIG. 7 is the second 3-D illustrative view in assembly of theconventional wiper arm with trapezohedron shaft in association with itsjoint assembly.

FIG. 8 is the third 3-D illustrative view in assembly of theconventional wiper arm with trapezohedron shaft in association with itsjoint assembly.

FIG. 8C is a cross sectional view on line 8C-8C of FIG. 8.

FIG. 9 is the fourth 3-D illustrative view in assembly of theconventional wiper arm with trapezohedron shaft in association with itsjoint assembly.

FIG. 10 is the first operation illustrative view of the conventionalwiper arm with trapezohedron shaft in the combination with windshieldwiper.

FIG. 11 is the second operation illustrative view of the conventionalwiper arm with trapezohedron shaft in the combination with windshieldwiper.

FIG. 12 is the illustrative view in dismantling step of the conventionalwiper arm with trapezohedron shaft in association with its jointassembly.

FIG. 13 is the 3-D view of the upper cover body of the presentinvention.

FIG. 14 is the cross-sectional view of the portion taken on line of14-14 of FIG. 13.

FIG. 15 is the cross-sectional view of the portion taken on line of15-15 of FIG. 13.

FIG. 16 is the 3-D view of the chassis of the present invention.

FIG. 17 is the cross-sectional view of the portion taken on line of17-17 of FIG. 16.

FIG. 18 is the first 3-D illustrative view in assembly of the presentinvention and the conventional wiper arm with trapezohedron shaft.

FIG. 19 is the second 3-D illustrative view in assembly of the presentinvention and the conventional wiper arm with trapezohedron shaft.

FIG. 20 is the third 3-D illustrative view in assembly of the presentinvention and the conventional wiper arm with trapezohedron shaft.

FIG. 21 is the fourth 3-D illustrative view in assembly of the presentinvention and the conventional wiper arm with trapezohedron shaft.

FIG. 22 is the illustrative view of the present invention in buckleengagement action of the upper cover body with chassis.

FIG. 23 is the first operation illustrative view of the presentinvention in combination with the windshield wiper and conventionalwiper arm with trapezohedron shaft.

FIG. 24 is the second operation illustrative view of the presentinvention in combination with the windshield wiper and conventionalwiper arm with trapezohedron shaft.

FIG. 25 is the illustrative view of the present invention in dismantlingstep from the conventional wiper arm with trapezohedron shaft.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIG. 13 through FIG. 17, the present invention, jointassembly of a car windshield wiper arm comprises:

an upper cover body 4O, having a front side 41, a top side 42, a bottomside, a left side 43, a right side 44, a rear end 45, and a solid core46 between said left side 43 and said right side 44; wherein, a leftgroove cut 462 is formed upward from said bottom side between said leftside 43 and said solid core 46, and a right groove cut 463 is formedupward from said bottom side between said right side 44 and said solidcore 46 (as shown in FIG. 14); a round groove cut 464 with V-shapedcross-section is concaved near said front side 41; a trapezohedronreceptacle 47 is formed horizontally across a rear of said solid corehaving a rear facing opening; said left side 43 and right side 44respectively including a parallel and symmetrical left rib 431 and rightrib 441, said left rib 431 and said right rib 441 extending from belowsaid trapezohedron receptacle 47 rearward to said rear end 45 toencompass a hollow socket 48; an elastic upright embed hook 49 is builtand centered on a top surface of said rear end 45 in correspondence withsaid trapezohedron receptacle 47; a horizontal insetting nose 491 isformed in a middle section of said elastic upright embed hook 49 withdirection facing towards said hollow socket 48 (as shown in the FIG.15); and

a chassis, having a bottom plate, a left plate 52, a right plate and arear plate 54; wherein, a fixing hole 511 is perforated at the center ofsaid bottom plate 51; a pair of parallel and symmetrical inset clips 512are concaved between said fixing hole 511 and a front edge of saidbottom plate 51; the wiper elastic strip 5 can be securely infixed withsaid chassis 50 by means of a rivet through said fixing hole 511together with said two inset clips 512 so that no displacement ordetachment occurs; and, said left plate 52 and right plate 53 areextended upward from respective left and right sides of said bottomplate, the left plate 52 and right plate 53 being parallel andsymmetrical; an upright curbing plate 55 is formed by bending the rearend of said bottom plate 51 upwards (as shown in the FIG. 17); ahorizontal fixing pivot 56 is bridged between said left plate 52 andsaid right plate 53 near the front end; an upright hollow plug 57 isencompassed by extending a middle section of said left plate 52 and saidright plate 53 backwards to said rear plate 54; an insetting hole 541 isperforated at the center of said rear plate 54 to allow buckleengagement of said insetting nose 491 at said elastic upright embed hook49 of said upper cover body 40.

Refer to FIG. 18 through FIG. 22, steps of assembling the presentinvention with the conventional said wiper arm 1, with saidtrapezohedron shaft 2, are shown. First, align said round groove cut 464on the said core 46 of said upper cover body 40 with said fixing pivot56 of said chassis 50 (as shown in the FIG. 18), and apply force to letthem engage each other in order to become a pivot (as shown in A view ofthe FIG. 22); subsequently, align said trapezohedron shaft 2 of saidwiper arm 1 with said trapezohedron receptacle 47 of said upper coverbody 40 (as shown in the FIG. 19); Finally, apply force downwards untilthe snap sound of said insetting nose 491 on said elastic upright embedhook 49 of said upper cover body 40 slipping into said insetting hole541 of said chassis 50 to make sure the finish of rigging join betweensaid wiper arm 1 and said wiper scraping blade 6 (as shown in the FIG.20); Then, with free rotation function of said trapezohedron shaft 2,said wiper is enabled to sway or tilt on said wiper arm 1 in some limit(as shown in the FIG. 21).

Refer to FIG. 22, the detailed steps of buckling engagement between saidupper cover body 40 and said chassis 50 are shown. First, said hollowsocket 48 on said upper cover body 40 is inserted by said hollow plug 57on said chassis 50, and contacted with said insetting nose 491 on saidelastic upright embed hook 49 (as shown in B view of the FIG. 22);

Under continuous acting force from said wiper arm 1, said elasticupright embed hook 49 will be deformed eventually, so that said uprightcurbing plate 55 on said chassis 50 will partially block the opening ofsaid trapezohedron receptacle 47 (as shown in C view of the FIG. 22);Finally, the opening of said trapezohedron receptacle 47 will becompletely blocked after said insetting nose 491 on said elastic uprightembed hook 49 fully infixes into said insetting hole 541 on said rearplate 54 (as shown in D view of the FIG. 22); Therefore, saidtrapezohedron shaft 2 is steadfastly confined in said trapezohedronreceptacle 47 so that said wiper scraping blade 6 is securely andfixedly jointed with said wiper arm 1.

Referring to FIG. 23 through FIG. 25, dismantling worn wiper forreplacement is shown. First, apply an upwards force on said wiper arm 1,which is tightly stay with the windshield G in horizontal position (asshown in the FIG. 23); With pivot of said elastic foldable articulation4, said wiper arm 1 is folded in upright position to enable the wiperscraping blade 6 remove away from windshield G (as shown in the FIG.24); Subsequently, exploiting the original sway space between of saidwiper arm 1 and said upper cover body 40, apply a force by fingerdirectly on said elastic upright embed hook 49 to bend it (as shown in Bview of the FIG. 25) so that said insetting nose 491 of said elasticupright embed hook 49 detaches off said insetting hole 541, and let saidupper cover body 40 start to detach off said chassis 50 (as shown in Cview of the FIG. 25); When said hollow socket 48 entirely detach offsaid hollow plug 57, said upright curbing plate 55 will not block theopening of said trapezohedron receptacle 47 any more; Due to said roundgroove cut 464 on said upper cover body 40 is still inset said fixingpivot 56 on said chassis 50 (as shown in D view of the FIG. 25), thewiper as being held will not drop downwards to hit and hurt windshieldat all; Finally, apply an upwards force on said upper cover body 40 tocompletely separate off said trapezohedron shaft 2 of said wiper arm 1;furthermore, without any component force, said wiper arm 1 will notunexpectedly re-bounce back to cause any serious loss by hitting andhurting windshield; moreoever, said upper cover body 40 will notinadvertently drop on the ground due to said round groove cut 464 beinginset by said fixing pivot 56 on said chassis.

1. A joint of a car windshield wiper arm, comprising: an upper coverbody having a front side, a top side, a bottom side, a left side, aright side, a rear end, and a solid core between said left side and saidright side; wherein a left groove cut is formed upward from said bottomside between said left side and said solid core, and a right groove cutis formed upward from said bottom side between said right side and saidsolid core; a round groove cut with V-shaped cross-section is concavednear said front side; a trapezohedron receptacle is formed horizontallyacross a rear of said solid core having a rear facing opening; said leftside and right side respectively including a parallel and symmetricalleft rib and right rib, said left rib and said right rib extending frombelow said trapezohedron receptacle rearward to said rear end toencompass a hollow socket; an elastic upright embed hook is built andcentered on a top surface of said rear end in correspondence with saidtrapezohedron receptacle; a horizontal insetting nose is formed in amiddle section of said elastic upright embed hook with direction facingtowards said hollow socket; and a chassis having a bottom plate, a leftplate, a right plate and a rear plate; wherein, a fixing hole isperforated at the center of said bottom plate; a pair of parallel andsymmetrical inset clips are concaved between said fixing hole and afront edge of said bottom plate; said left plate and right plate areextended upward from respective left and right sides of said bottomplate, the left plate and right plate being parallel and symmetrical; anupright curbing plate is formed by bending the rear end of said bottomplate upwards; a horizontal fixing pivot is bridged between said leftplate and said right plate near the front end; an upright hollow plug isencompassed by extending a middle section of said left plate and saidright plate backwards to said rear plate; an insetting hole isperforated at the center of said rear plate.